Tornado Warning 33, NWS Des Moines, IA

Issued

Jun 4, 1999, 12:41 PM CDT (17:41 UTC)

Expired

Jun 4, 1999, 1:30 PM CDT

In force

49 min

Issued by

NWS Des Moines, IA

Area

Whole counties

County Lucas County, IA

The Des Moines radar (KDMX), 85 km from the middle of the area, began a volume at 17:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

000 
TTAA00 KDSM 041740
TORDSM
IAC117-041830-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1241 PM CDT FRI JUN 4 1999

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  LUCAS COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 130 PM CDT

* AT 1240 PM CDT... DOPPLER RADAR INDICATED A TORNADO 32 MILES SOUTH
  OF DES MOINES OR 7 MILES NORTH NORTHWEST OF LUCAS... MOVING
  SOUTHEAST AT 30 MPH.

* THIS TORNADO CAN BE EXPECTED NEAR...
   LUCAS              BY 1254 PM CDT
   CHARITON           BY 107 PM CDT

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

DEROY

NWS Des Moines, IA wrote its last area forecast discussion before this tornado warning went out at Jun 4, 3:55 AM CDT, 8 hours 46 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
355 AM CDT FRI JUN 4 1999

WILL FOCUS ONLY ON THE FIRST 2 PERIODS OF THE FORECAST AND LEAVE THE
REST ALONE.

TWO AREAS OF CONCERN THIS MORNING ARE...FIRST THE LINE OF STORMS NOW
OVER NORTHEAST SECTIONS OF THE FORECAST AREA. THESE STORM WILL MOVE
EAST OF THE AREA BY AROUND 10Z. SO FAR NO SEVERE WEATHER TO REPORT.
SECOND AREA SOON TO BE IN WESTERN SECTIONS OF THE FORECAST AREA AND
WILL CONTINUE TO PROPAGATE EAST THIS MORNING AND HAS THE POTENTIAL OF
PRODUCING SOME SEVERE WEATHER UNTIL 12Z. 88D WIND PROFILE SHOWING 45
KTS AT 3000 FEET...SO GOOD INFLOW WILL CONTINUE INTO THE STORMS OVER
WESTERN IOWA THROUGH THE EARLY MORNING HOURS. ANTICIPATING THIS LINE
TO WEAKEN THIS MORNING. HOWEVER LEFT OVER OUT FLOW BOUNDARY MAY BE
CAUSE FOR FOCUS OF AFTERNOON CONVECTION.

MODELS DOING POORLY WITH QPF IN DETERMINING THE AREAS OF CONVECTION
THIS MORNING. WILL GO WITH THE ETA MODEL FOR THIS FORECAST PACKAGE.
MAIN CONCERN WILL BE FOR TONIGHT AS LOW LEVEL JET STRENGTHENS AND LOW
LEVEL WARM ADVECTION INCREASES ESPECIALLY OVER WESTERN IOWA. WARM
FRONTAL BOUNDARY OVER CENTRAL SECTION OF THE STATE HELPING TO FOCUS
LIFT AND WITH CAPES AROUND 4000 TO 5000 J/KG AND SHEAR VALUES IN THE
30S THE POTENTIAL FOR SEVERE WEATHER WILL BE SIGNIFICANT AS
WELL...WILL HIGHLIGHT THIS IN THE ZONES.

.DSM...NONE

Tornado Warnings in Iowa, 1999Every tornado warning in 1999Tornadoes in 1999

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.